What are three ways carnegie, rockefeller and other corporate leaders consolidated control over their industries?

The ways that Carnegie, Rockefeller and other corporate leaders consolidated control over their industries is that they established a monopoly or trust, which centralized control of a number of oil-related companies under one board of trustees. As a result, they owned nearly the entire oil business in the United States, and could set prices at will. Companies in other industries quickly imitated their trust model and used their broad market control to push prices higher.

Protecting and assisting  u.s. citizens  living or traveling abroad; assisting u.s.  businesses  in the international marketplace; coordinating and providing support for international activities of other u.s. agencies (local, state, or federal government), official visits overseas and at home, and other diplomatic efforts.keeping the public informed about u.s. foreign policy and relations with other countries and providing feedback from the public to administration officials.providing  automobile registration  for non-diplomatic staff vehicles and the vehicles of diplomats of foreign countries having  diplomatic immunity  in the united states